[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [PATCH] add oprofile Kconfig

This is a trivial patch to add kernel config support for oprofile. I have been using oprofile for the last few days (timer int based) and it seems to work "OK". IMO, oprofile could stand a lot of virtualization awareness, and I would like to discuss what everyone would like to see.

I would like oprofile to have the ability to profile the entire system, including xen and all running domains. I would think running oprofile daemon in dom0 would be adequate, as long as we could (a) modify oprofile driver to tell xen what kind of events we need (b) have xen forward data for those events to dom0 (c) add info in that data that tells oprofile what domain or if xen was running (d) modify oprofile reporters to be aware of the new data and have reference to bins in other running domains.

I suppose oprofile could still be run in a domU, but probably just timer int based profiling. If one would want to use perf counters in just the context of a single domU, I guess we would have to save/restore that data on the cpus as we switch from/to that domU?

-Andrew Theurer
diff -Naurp xen-unstable-orig/linux-2.6.10-xen-sparse/arch/xen/Kconfig.drivers 
--- xen-unstable-orig/linux-2.6.10-xen-sparse/arch/xen/Kconfig.drivers  
2005-02-24 22:12:10.000000000 -0600
+++ xen-unstable/linux-2.6.10-xen-sparse/arch/xen/Kconfig.drivers       
2005-02-25 14:55:49.410321096 -0600
@@ -52,4 +52,6 @@ config UNIX98_PTYS
        default y
+source "arch/i386/oprofile/Kconfig"



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.